> For the complete documentation index, see [llms.txt](https://iris-go.gitbook.io/iris/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://iris-go.gitbook.io/iris/dependency-injection/outputs.md).

# Outputs

* if the return value is `string` then it will send that string as the response's body.
* If it's an `int` then it will send it as a status code.
* If it's an `error` then it will set a bad request with that error as its reason.
* If it's an `error` and an `int` then the error code is the output integer instead of 400(bad request).
* If it's a custom `struct` then it sent as a JSON, when a Content-Type header is not already set.
* If it's a custom `struct` and a `string` then the second output value, string, it will be the Content-Type and so on.

| Type                                                                                   | Replies to                    |
| -------------------------------------------------------------------------------------- | ----------------------------- |
| string                                                                                 | body                          |
| string, string                                                                         | content-type, body            |
| string, int                                                                            | body, status code             |
| int                                                                                    | status code                   |
| int, string                                                                            | status code, body             |
| error                                                                                  | if not nil, bad request       |
| any, bool                                                                              | if false then fires not found |
| <Τ>                                                                                    | JSON body                     |
| <Τ>, string                                                                            | body, content-type            |
| <Τ>, error                                                                             | JSON body or bad request      |
| <Τ>, int                                                                               | JSON body, status code        |
| [Result](https://pkg.go.dev/github.com/kataras/iris/v12/hero#Result)                   | calls its `Dispatch` method   |
| [PreflightResult](https://pkg.go.dev/github.com/kataras/iris/v12/hero#PreflightResult) | calls its `Preflight` method  |

> Where `<T>` means any struct value.